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    <title>Document</title>
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    <h1>表单单选框</h1>
    <div>你觉得自己是个大聪明嘛？</div>
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        <!-- 默认选中checked="checked" 属性值可省略 直接写checked-->
        <input type="radio" name="aaa" checked="checked">是的
    </div>
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        <input type="radio" name="aaa">不是
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        <input type="radio" name="aaa">反弹
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    <div>
        <div>你的物种：</div>
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            <!-- 单选框标签 -->
            <input type="radio" name="bbb" id="man" checked>
            <!-- 选择文字自动选择单选框 -->
            <label for="man">禽</label>
        </div>
        <div>
            <input type="radio" name="bbb" id="woman">
            <label for="woman">兽</label>
        </div>
    </div>
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